%% @author Mochi Media <dev@mochimedia.com>
%% @copyright 2010 Mochi Media <dev@mochimedia.com>

%% @doc Supervisor for the gameweb application.

-module(gameweb_sup).
-author("Mochi Media <dev@mochimedia.com>").

-behaviour(supervisor).

%% External exports
-export([
        start_link/0
        ,upgrade/0
        ,start_worker/2
        ,start_ssl_worker/4
    ]
).

%% supervisor callbacks
-export([init/1]).

%% @spec start_link() -> ServerRet
%% @doc API for starting the supervisor.
start_link() ->
    supervisor:start_link({local, ?MODULE}, ?MODULE, []).

%% @spec upgrade() -> ok
%% @doc Add processes if necessary.
upgrade() ->
    {ok, {_, Specs}} = init([]),

    Old = sets:from_list(
            [Name || {Name, _, _, _} <- supervisor:which_children(?MODULE)]),
    New = sets:from_list([Name || {Name, _, _, _, _, _} <- Specs]),
    Kill = sets:subtract(Old, New),

    sets:fold(fun (Id, ok) ->
                      supervisor:terminate_child(?MODULE, Id),
                      supervisor:delete_child(?MODULE, Id),
                      ok
              end, ok, Kill),

    [supervisor:start_child(?MODULE, Spec) || Spec <- Specs],
    ok.

%% @spec init([]) -> SupervisorTree
%% @doc supervisor callback.
init([]) ->
    Strategy = {one_for_one, 10, 10},
    {ok,
        {Strategy, []}}.

start_worker(WebPort, HandleMod)->
    Spec = web_specs(gameweb_web, WebPort, HandleMod, []),
    supervisor:start_child(?MODULE, Spec).

start_ssl_worker(WebPort, HandleMod, SslPrivateKeyPath, SslPubKeyPath) ->
    ExtCfgs = [{ssl, true}, {ssl_opts, [{keyfile, SslPrivateKeyPath}, {certfile, SslPubKeyPath}]}],
    Spec = web_specs(gameweb_web, WebPort, HandleMod, ExtCfgs),
    supervisor:start_child(?MODULE, Spec).

web_specs(Mod, Port, HandleMod, ExtCfgs) ->
    WebConfig = [
        {ip, {0,0,0,0}}
        ,{port, Port}
        ,{docroot, gameweb_deps:local_path(["priv", "www"])}
        ,{handle_mod, HandleMod}
    ] ++ ExtCfgs,
    {Mod, {Mod, start, [WebConfig]}, permanent, 5000, worker, dynamic}.
